Electric motor



mmm J, A, DAVIS au RQA. POWDBN.

ELECTRIC MOTDR.

No. 506,209. Patented 0013.10, 1893.

W/ T/vS/SES: /-M 4 Mme/2d, M z.. M-

UNITED STATES PATENT OFFICE.

JOB A. DAVIS AND ROBERT A. FOVVDEN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNORS TO THE INTERNATIONAL PRINTING TELEGRAPII COMPANY,

OF CAMDEN, NEW JERSEY.

ELECTRIC MOTOR.

SPECIFICATION forming part of Letters Patent No. 506,209, dated October 10, 1893.

Application tiled December 23, 1892. Serial No.4e56,143. (No model.)

To all whom it may concern:

Beit known that we, JOB A. DAVIS and ROB- ERT A. FOWDEN, citizens of the United States, residing at the city of Philadelphia, in the 5 county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Electric Motors, of which the following is a specification.

Our invention relates to improvements in xo step-by-step electric motors for synchronously controlling clocks, telegraph, stock or type printing and other instruments.

The principal objects of our invention are first, to provide a simple, reliable and com- 15 paratively inexpensive electric-motor adapted to drive a revoluble member with a uniform intermittent motion and to limit and equalize the steps of said intermittent motion; and second, to provide a step by step zo electric-motor constructed and arranged for operation in such manner that a series of the motors looped in line are adapted to synchronously operate and control clocks, telegraph, stock or type printing instruments. z5 Our invention consists of a step by step electric-motor, comprising a revoluble member provided with ratchet and escape-wheels, and means responding to electrical impulses in line and provided with pawls, whereof one operates by a thrust and the otheris provided with a hook shaped extremity and operates by a pull to rotate said ratchet-wheel and with detents, stop-dogs, pallets or anchors for limiting and adjusting the movements of the 3 5 escape-wheel.

Our invention further consists of a series of instruments having a revolublc member thereof provided with ratchet and escapewheels and having means responding to elec- 4o trical impulses in line and provided with pawls, whereof one operates by a thrust and the other is provided with a hook-shaped entremity and operates by a pull to rotate said ratchet-wheel and with detents, stop -dogs, 45 pallets or anchors for limiting and ad] usting the movements of the escape-wheel, and a line circuit controlled by electrical and mechanical devices actuated by thel revoluble member of an instrument synchronously operated in conjunction with all the other in- 5o struments connected in circuit therewith.

Our invention further consists of the improvements hereinafter fully described and claimed.

The nature, objects and scope of ourinven- 55 tion will be more fully understood from the following description taken in connection with the accompanying drawings forming part hereof, and in whieh- Figure l, is a diagrammatic view illustrat- 6o ing a series of clocks provided respectively with step by step motors embodying features of our invention and controlled and synchronized by means of electrical and mechanical devices operated by the principal clock. Fig. 6 5 2, is a side view partly in section, illustrating a step by step electric motor embodying features of our invention in application to one of the series of clocks shown at the right hand side of Fig. 1. Fig. 3, is a detached plan view, 7o showing a revoluble member provided with a ratchet-wheel and an escape-wheel and a bar provided with pawls operating respectively by a thrust and a pull to intermittently rotate said member and with detents, stop-dogs, 7 5 pallets or anchors for limiting said intermittent motion; and Fig. 4t, is a side view of a circuit breaker and closer operated by the revoluble member of the principal clock and adapted to control the line circuit.

In the drawings a, is a revoluble member, in the present instance, the minute hand spindle or shaft of one of the series of clocks b, b and b2, which are provided respectively with minute hands b3, and with hour hands b4,'con 8 5 trolled by the minute hand h3, through the instrumentality of a train of gearing b5. This revoluble-member a, is provided with a ratchet-wheel a', and with an escape wheel a2.

c, is a bar provided with a slot c', for the 9o accommodation of the revoluble member (t, andv guided by means of a collar c2, adjustably connected with the revoluble member a, by means of a set-screw.

d and d', are pawls pivotally attached to 95 the bar c, by means of a post or screw d2, and held normally in engagement with the teeth of the ratchet a', by means of a spring s. The

working extremity of the pawl d, operated by a thrust to rotate the ratchet-wheel a', in the direction indicated by the arrow in the drawings when the bar c, is shifted toward the left and the working extremity of the pawl d', is hook-shaped and operates by a pull to rotate the ratchet-wheel a', in the same direction when the bar c, is shifted toward the right. e and e', are detents, stop-dogs, pallets or anchors carried by the bar c, and adapted to engage the teeth of the escape wheel a2, and thus limit and adjust the steps of the intermittent motion imparted to the revoluble member a, by the pawls d and d2. The bar c, is pivotally connected with the armaturelever f, of an electro-magnet f', and the armature-lever f, is solicited normally into the position illustrated in the drawings, by means of a retracting-spring S, so that when the circuit is closed through the coils of the electroinagnet f', the armature-lever f, is pulled up, thus causing the bar c, to be shifted toward the left inthe drawings, with the result that the pawl d engages the ratchet-wheel a', and shifts the revoluble-member a, and the detent, stop-dog, pallet oranchor e', engages the escape wheel a2, and limits and adjusts the range of motion of the revoluble member a. Then the circuit through the magnet f', is interrupted, the bar c, is shifted by the spring s', toward the right, with the result that the pawl d', engages the ratchet-wheel a', and rotates the member a, whereupon the detent, stop-dog, anchor or pallet e, engages the escapement wheel a2, and thus adjusts and limits the range of motion of the member a.

g, is a circuit breaker and closer operated by the minute hand spindle or shaft g', of a mechanically driven principal clock g2. v The circuit breaker and closer g, in the present instance, comprises two disks g3 and g4, insulated from the shaft or spindle g', and in electrical communication with each other. The periphery of the disk g4, is of `conducting material,and the periphery of the disk g3, is provided with insulatingpoints or contacts g5, of which there are in the present instance sixty corresponding with the number of minutes in one hour. The contact spring 7L, of the circuit breaker and closer g, is connected to earth through a battery t', by a conductor Z, and the` contact spring h', of the circuit breaker and closer g, is connected to earth through a battery vl', and through the coils of the magnets f', of the motors of the series of clocks h, b and b2, by means of aconductor2.

The mode of operation of the hereinabove described apparatus is as follows:-The revolution of the hour hand spindle or shaft g', causes the circuit breaker and closer g, to make and break the circuit through the coils of the magnets f', of the series of clocks b, b and b2, once every minute, and each makein the circuit through the coils of the magnets f', causes the bar c, to be shifted toward .the

left under the iniiuence of the magnets f', and each break in the circuit causes the bar C, to be shifted under the influence of the spring s', toward the right, and these movements of the bar c, cause the revoluble member or minute hand spindle auf each clock to be rotated for a distance corresponding to a minute as designated upon the faces or dials of the clocks l), b and h2. It being understood that for this purpose the ratchet-wheel a', is provided with one hundred and twenty teeth, and that the escape-wheel a2 is provided with two hundred and forty teeth, although for the sake of clearness a less number of teeth is shown in the drawings. The repetition of the hereinabove described makes and breaks or impulses in the line circuit causes each of the motors to drive its correspending clock in such manner that all the clocks move synchronously and in unison and are controlled by the principal clock g2.

It will be obvious to those skilled in the art to which our invention appertains that modifications may be made in the details of our invention without departing from the spirit thereof, and hence we do not limit ourselves to the precise construction and arrangement of parts hereinabove explained and illustrated in the accompanying drawings.

Having thus described the nature and objects of our invention, what we claim as new, and desire to secure by Letters Patent, is-

l. A step by step electric-motor, comprising a revoluble-member provided with ratchet and escape wheels, and a slotted device or bar for accommodating said revoluble member and responding to electrical impulses and provided with pawlsnvhereof one is provided with a hook-shaped extremity and operates by apull and whereof the other operates by a push or thrust to rotate said ratchet-wheel, and detents, pallets, stop-dogs or anchors mounted on said device or bar and adapted to limit and adjust the movements of the escape-wheel, substantially as and for the purposes set forth.

2. A step by step electric-motor, having a revoluble-member yprovided with ratchet and escape-wheels, a bar provided with a slot for the accommodation of said revoluble-member, and with pivotal pawls, whereof one is provided with a hookshaped extremity and rotates said ratchet-wheel by a pull and whereof the other rotates said ratchet-wheel by a push or thrust, and detents, pallets or stopdogs carried by said bar and adapted to limit and adjust the movements of the escapewheel, substantially as and for the purposes set forth.

3. In combination, a series of instruments having a revoluble-member provided with ratchetl and escapewheels, a slotted device for the accommodation of said revoluble member and responding to electrical impulses in line and provided with pawls, whereof one operates by a thrust and the other is provided with a hook-shaped extremity and operates bya pull to rotate said ratchet-wheel, pallets, detents or anchors for limiting and adjusting IOO the movements of the escape-wheel, a line circuit, electrical and mechanical devices actuated by a principal instrument and adapted to synchronously operate all the primary instruments therewith, substantially as and for the purposes set forth.

4. In combination, a series of instruments having a revoluble-member provided with ratchet and escape-wheels, a slotted bar for the accommodation of said revoluble member, and responding to electrical impulses in line and provided with pawls, whereof one is provided with a hook-shaped extremity adapted to operate by a pull and whereof the other is adapted to operate by a thrust to rotate said ratchet-wheel, detents, pallets or anchors for limiting and adjusting the movement of the escape-wheel, and a line circuit controlled by a circuit breaker and closer actuated by a principal instrument and adapted to synchronously operate all the otherinstruments JOB A. DAVIS. ROBERT A. FOWDEN.

Witnesses:

THOMAS M. SMITH, RICHARD C. MAXWELL. 

